upload-pack: generalize commit date cutoff

The ok_to_give_up() method uses the commit date as a cutoff to avoid
walking the entire reachble set of commits. Before moving the
reachable() method to commit-reach.c, pull out the dependence on the
global constant 'oldest_have' with a 'min_commit_date' parameter.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/upload-pack.c b/upload-pack.c
index 9fe19003c6b7f511c2fcb3b5280c3c823dc33eaa..427de461d85a3149af934d14887571aaf1c18b42 100644 (file)
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -337,7 +337,7 @@ static int got_oid(const char *hex, struct object_id *oid)
 }
 
 static int reachable(struct commit *from, unsigned int with_flag,
-                    unsigned int assign_flag)
+                    unsigned int assign_flag, time_t min_commit_date)
 {
        struct prio_queue work = { compare_commits_by_commit_date };
 
@@ -355,7 +355,7 @@ static int reachable(struct commit *from, unsigned int with_flag,
                if (commit->object.flags & REACHABLE)
                        continue;
                commit->object.flags |= REACHABLE;
-               if (commit->date < oldest_have)
+               if (commit->date < min_commit_date)
                        continue;
                for (list = commit->parents; list; list = list->next) {
                        struct commit *parent = list->item;
@@ -372,11 +372,13 @@ static int reachable(struct commit *from, unsigned int with_flag,
 /*
  * Determine if every commit in 'from' can reach at least one commit
  * that is marked with 'with_flag'. As we traverse, use 'assign_flag'
- * as a marker for commits that are already visited.
+ * as a marker for commits that are already visited. Do not walk
+ * commits with date below 'min_commit_date'.
  */
 static int can_all_from_reach_with_flag(struct object_array *from,
                                        unsigned int with_flag,
-                                       unsigned int assign_flag)
+                                       unsigned int assign_flag,
+                                       time_t min_commit_date)
 {
        int i;
 
@@ -395,7 +397,8 @@ static int can_all_from_reach_with_flag(struct object_array *from,
                        from->objects[i].item->flags |= assign_flag;
                        continue;
                }
-               if (!reachable((struct commit *)from_one, with_flag, assign_flag))
+               if (!reachable((struct commit *)from_one, with_flag, assign_flag,
+                              min_commit_date))
                        return 0;
        }
        return 1;
@@ -406,7 +409,8 @@ static int ok_to_give_up(void)
        if (!have_obj.nr)
                return 0;
 
-       return can_all_from_reach_with_flag(&want_obj, THEY_HAVE, COMMON_KNOWN);
+       return can_all_from_reach_with_flag(&want_obj, THEY_HAVE,
+                                           COMMON_KNOWN, oldest_have);
 }
 
 static int get_common_commits(void)